mono: Install from tarball.

git clone mono takes very long time...
Use 3.2.8 insetead of 3.4.0
--without-profile2 may break build.
Merge branch 'mono-tarball' of http://github.com/methane/FrameworkBenchmarks into 873
873 renamed mono folder

Contributor added some install improvements for mono,
added a quick command to change the install folder name.